P. ulyssiponensis: Mature individuals were generally observed throughout the whole year, with the exception of the May/June period, with several spawning events throughout the year (Fig. A3
supporting material). The effect of coastal area on the beginning of the reproductive cycle could not be studied, since it was not possible to observe the start of the cycle during the sampling period 89% of limpets at R1 site were mature at the beginning of the sampling (Fig. A3 Supporting material). Nevertheless, the influence of size on the start of the cycle was observed (2 = 6.96, p < 0.01), smaller individuals began the cycle with a lag of 11 (±10 SE) days. An influence of the coastal region on the end of the cycle was observed (2 = 20.21, p < 0.0001), with the cycle in the Cantabrian coast ending 52 (±4 SE) days later than in the Atlantic coast (Fig. 3c; Table 1). A relation between size and cycle amplitude was also observed